I've got a batch 4 (1x full node + 2x standard nodes), it eventually sync'd and is running fine, however I only see two hashboards on the miner tab, so was wondering if it was possible to use all 3x units as miners and if so, how do you configured such things?
I found that using the 2 x USB 3.0 ports work the best. Also try this..
Shut down the entire setup. Start the 2 standards first (assuming you have separate power supplies) and then start the full node.
If not then give it 10 minutes and then reboot through the gui!
Best of luck!